A large part of many employees' day is spent chatting to others in the office and browsing the web. My guess is compressing their day into 6 hrs will make them more stressed out because they won't be able to relax at the office
Are you sure this kind of web browsing is really relaxing?
In my personal experience, office work involves a lot of pure time wasting, time I'd rather spend doing other things than browsing reddit in my cubicle: grocery shopping, being in the sun, exercising, reading, or anything else.
At the Gothenburg office I worked in, literally everyone I talked to about a 6 hour work week saw it as extremely desirable. I didn't ask the manager, and she'd probably work more anyway, but I don't think she'd oppose it if it made employees happier.
